Organic light emitting display device and driving method thereof

ABSTRACT

An organic light emitting display device and a driving method thereof are disclosed. The display device has sub-pixels of multiple colors. In one aspect, the organic light emitting display device detects sub-pixels which are positioned at the edges of the panel. Data for the sub-pixels on the edges are reduced so that colors on the edges are less observable.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/207,023, filed Nov. 30, 2018, which is a continuation of U.S. patentapplication Ser. No. 13/752,154, filed Jan. 28, 2013, now U.S. Pat. No.10,147,351, which claims priority to and the benefit of Korean PatentApplication No. 10-2012-0100881, filed Sep. 12, 2012, the entire contentof all of which is incorporated herein by reference.

BACKGROUND Field

The disclosed technology relates to an organic light emitting displaydevice and a driving method thereof, and more particularly, to anorganic light emitting display device and a driving method thereofhaving high image quality.

Description of the Related Technology

An organic light emitting display (OLED) device is used to display animage using organic light emitting diodes that are self-luminescentelements. Such a display device is widely used as a next-generationdisplay device because of its excellent luminance and color purity.

In display devices, pixels include red sub-pixels, green sub-pixels andblue sub-pixels, and accordingly, various color images are displayed.

The red sub-pixels, the green sub-pixels and the blue sub-pixels may bearranged in various configurations. The red sub-pixels, the greensub-pixels and the blue sub-pixels are generally arranged linearly, forexample, such that sub-pixels of the same color are arranged in acolumn.

If the sub-pixels are linearly arranged, an aperture ratio is reduced byblack non-emitting structure positioned between the respectivesub-pixels, and the ability to display a high-resolution image isdegraded.

To solve such a problem, “ClairVoyante Laboratories Inc.” has proposed apixel arrangement structure, entitled as “The Pentile Matrix Color PixelArrangement.” In the Pentile matrix color pixel arrangement, red andblue sub-pixels are alternately formed on the same column, and greensub-pixels are formed on an adjacent column. Furthermore, color pixelarrangement, the number of sub-pixels is decreased to approximately ⅔ ofthat in the linear arrangement, a high aperture ratio is achieved. Suchan arrangement may be applied in an OLED display device to display ahigh-resolution image and to improve image quality by using a structurein which does use the linear arrangement. However, in the Pentilearrangement, green and red colors are seen as lines (greenish andpinkish) at edges of the OLED display device.

SUMMARY OF CERTAIN INVENTIVE ASPECTS

One inventive aspect is an organic light emitting display device. Thedisplay device includes a pixel unit having a plurality of sub-pixels, ascan driver configured to drive scan lines coupled to the sub-pixels, adata driver configured to drive data lines coupled to the sub-pixels andpositioned in a direction intersecting the scan lines, and a dataprocessor configured to receive a first data and to generate a seconddata based on the first data. The data processor generates the seconddata by changing grayscale values of the first data for sub-pixelspositioned at edges of the pixel unit.

Another inventive aspect is a method of driving an organic lightemitting display device. The method includes sensing a sub-pixel colorarrangement of a display panel, and generating second data by changinggrayscale values of first data to be supplied to sub-pixels positionedat edges of the panel, according to the sub-pixel color arrangement.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, together with the specification, illustrateexemplary embodiments, and, together with the description, serve toexplain certain inventive features, aspects, and principles.

FIG. 1 is a view illustrating a pixel arrangement structure of anorganic light emitting display device according to an embodiment.

FIGS. 2A to 2D are views illustrating patterns of data corresponding topositions of a panel.

FIGS. 3A to 3D are views illustrating states in which specific colorsare recognized in the form of lines, corresponding to positions of thepanel.

FIG. 4 is a block diagram illustrating an organic light emitting displaydevice according to an embodiment.

FIG. 5 is a block diagram illustrating a data processor according to anembodiment.

FIG. 6 is a flowchart illustrating an operation of a dimming unitaccording to an embodiment.

DETAILED DESCRIPTION OF CERTAIN INVENTIVE EMBODIMENTS

Hereinafter, certain exemplary embodiments are described with referenceto the accompanying drawings. Here, when a first element is described asbeing coupled to a second element, the first element may be directlycoupled to the second element or may be indirectly coupled to the secondelement via a third element. Further, some of the elements that are notessential to the complete understanding are omitted for clarity. Also,like reference numerals generally refer to like elements throughout.

FIG. 1 is a view illustrating a pixel arrangement structure of anorganic light emitting display device according to an embodiment.Referring to FIG. 1, in the organic light emitting display deviceaccording to this embodiment, red and blue sub-pixels R and B arerepetitively arranged on a particular column, and a green sub-pixel isrepetitively arranged adjacent to the particular column. That is, thesub-pixels R, G and B are arranged in a Pentile matrix form.

Red and green sub-pixels R and G or blue and green sub-pixels B and Gare arranged in each pixel region 100. In each pixel region 100, the redand green sub-pixels R and G are positioned in a diagonal direction. Inthis case, the interval between the red and green sub-pixels R and G maybe a high-resolution panel. Similarly, the blue and green sub-pixels Band G are also positioned in a diagonal direction. Meanwhile, in someembodiments of the organic light emitting display device, the sub-pixelsR, G, B and G positioned in two adjacent pixel regions 100 constituteone pixel to be driven.

In the pixel arrangement structure of some embodiments, the greensub-pixel G may be formed to have a narrower area than the red and bluesub-pixels R and B, in consideration of light emitting efficiency. Theblue sub-pixel B may be formed to have a wider area than the redsub-pixel R, in consideration of the light emitting efficiency. Theareas of the sub-pixels R, G and B may be changed in consideration ofthe light emitting efficiency.

Meanwhile, in a case where a panel having the pixel arrangementstructure of some embodiments is used in a portable device, data ischanged and supplied depending on a change in position of the panel. Forexample, in a case where the panel is driven at a normal position, thedata is supplied in a first pattern (R, G, B, G, . . . ) as shown inFIG. 2A. In a case where the panel is rotated to the left side at 90degrees, the data is supplied in a second pattern (G, B, G, R, . . . )as shown in FIG. 2B. In a case where the panel is rotated to the rightside at 90 degrees, the data is supplied in a third pattern (B, G, R, G,. . . ) as shown in FIG. 2C. In a case where the panel is verticallyreversed, the data is supplied in a fourth pattern (G, R, G, B, . . . )as shown in FIG. 2D. However, in the organic light emitting displaydevice of some embodiments in which the sub-pixels are arranged in thePentile matrix form, there is a problem in that one color is seen at anedge of the panel.

Practically, in a case where the data is input in the first pattern, asshown in FIG. 3A, a pinkish strip may be strongly recognized at upperand left edges, and a greenish stripe is strongly recognized at a rightedge. Similarly, in a case where the data is supplied in the second tofourth patterns, pinkish and greenish stripes are strongly recognized atedges as shown in FIGS. 3B to 3D.

To solve such a problem, a dimming process may be performed on datasupplied to sub-pixels R, G and B positioned at the edges of the panel.Here, the dimming process refers to a process of reducing the grayscalevalue of the data supplied to the edges of the panel so as to preventthe color from being strongly recognized along the edges.

FIG. 4 is a block diagram illustrating an organic light emitting displaydevice according to an embodiment. Referring to FIG. 4, the organiclight emitting display device according to this embodiment includes ascan driver 10 for driving scan lines S1 to Sn, a data driver 20 fordriving data lines D1 to Dm, a timing controller 50 for controlling thescan driver 10 and the data driver 20, and a data processor 30 forgenerating a second data data2 by performing a dimming process on afirst data data1 supplied from the outside thereof.

The sub-pixels R, G and B are arranged into a structure, as shown inFIG. 1, in a pixel unit 40 in which the scan lines S1 to Sn and the datalines D1 to Dm intersect with each other. The scan driver 10 supplies ascan signal to the scan lines S1 to Sn. Here, the scan driver 10 maysupply the scan signal in a forward or reverse direction, correspondingto the position of a panel. The data driver 20 generates a data signalusing the second data data2, and supplies the generated data signal tothe data lines D1 to Dm in synchronization with the scan signal. Then,the data signal is supplied to sub-pixels R, G and B selected by thescan signal. The timing controller 50 supplies a control signal (notshown) for controlling the scan driver 10 and the data driver 20. Thetiming controller 50 provides, to the data driver 20, the second datadata2 supplied from the data processor 30. The data processor 30generates the second data data2 by detecting a pattern (one of the firstto fourth patterns) of data and performing a dimming process on thefirst data data1, corresponding to the detected pattern. Practically,the data processor 30 generates the second data data2 by reducing thegrayscale value of the first data data1 to be supplied outermostsub-pixels of the panel so that a specific color is not recognized at anedge of the panel. The detailed operation of the data processor 30 willbe described later.

FIG. 5 is a block diagram illustrating the data processor according toan embodiment. Referring to FIG. 5, the data processor 30 according tothis embodiment includes a sub-pixel rendering (SPR) unit 32 and adimming unit 34.

The SPR unit 32 operates according to an algorithm for improvingreadability of characters, etc. Any one of various algorithms currentlyknown in the art may be applied with the SPR unit 32 in conjunction witha Pentile pixel arrangement. Additionally, the SPR unit 32 may beomitted in some embodiments. The dimming unit 34 generates the seconddata data2 by controlling the grayscale values of the first data data1to be supplied sub-pixels positioned at the outermost edges of thepanel, corresponding to the pattern of data.

FIG. 6 is a flowchart illustrating a method of operating the dimmingunit according to an embodiment. Referring to FIG. 6, the dimming unit34 checks whether or not the first data data1 input thereto is a data ofthe first or last line. Practically, as shown FIGS. 3A to 3D, the firstdata data1 supplied to the first and last lines is generated as thesecond data data2 by performing a dimming process on the first datadata1.

The dimming unit 34 generates the second data data2 by performing adimming process on the first data data1 to be supplied to the first andlast pixels positioned on each of the lines other than the first andlast lines. That is, the dimming unit 34 generates the second data data2by reducing the grayscale values of the first data data1 to be suppliedto sub-pixels R, G and B positioned at edges of the panel, and suppliesthe generated second data data2 to the timing controller 50.

The operation of the dimming unit 34 will be described in furtherdetail. The dimming unit 34 decides whether or not the first data data1input from the outside thereof is a data to be supplied to the firstline (S200). In a case where it is decided in step S200 that the firstdata data1 is the data to be supplied to the first line, the dimmingunit 34 checks a pattern of the data pattern (S202). Here, the patternof the data is divided into first, second, third and fourth patterns asshown in FIGS. 3A to 3D.

In a case where it is decided in step S202 that the pattern of the datais the first pattern, the dimming unit 34 decides whether or not thefirst data data1 is supplied to the first pixel of the first line(S204).

In a case where it is decided in step 204 that the first data data1 issupplied to the first pixel, the dimming unit 34 decides whether thepattern of the data is the second or fourth pattern (S206). Here, thepattern of the data has been decided as the first pattern in step S202,and hence the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 to be supplied tored and blue sub-pixels R and B (S214) (dimming process of R and Bpositioned at upper edge/left edge of FIG. 3).

In a case where the first data data1 does not correspond to the firstpixel in step S204, the dimming unit 34 decides whether or not the firstdata data1 is input to the last pixel of the first line (S210). If it isdecided in step S210 that the first data data1 is supplied to the lastpixel, the dimming unit 34 decides whether the pattern of the data isthe first or third pattern (S212). Here, the pattern of the data hasbeen decided as the first pattern in step S202, and hence the dimmingunit 34 performs a dimming process on the first data data1 correspondingto red, blue and green sub-pixels R, B and G2 (dimming process of R, Band G positioned at upper edge/right edge of FIG. 3A). Here, that thegreen sub-pixel is designated by G2 means that the green sub-pixel ispositioned in the same pixel region 100 as the blue sub-pixel B. Forconvenience of illustration, the green sub-pixel positioned in the samepixel region 100 as the red sub-pixel R is designated by G1. Meanwhile,in a case where it is decided in step S210 that the first data data1 isnot input to the last pixel, i.e., in a case where the first data data1is input to one of the pixels positioned between the first and lastpixels, the dimming unit 34 performs a dimming process on the first datadata1, corresponding to the red and blue sub-pixels R and B (S214). Asdescribed above, in a case where the data of the first pattern is input,the dimming unit 34 generates the second data data2 by performing adimming process on the first data data1 corresponding to sub-pixelspositioned at the upper edge while passing through steps S202 to S214.

In a case where it is decided in step S202 that the pattern of the datais the second pattern, the dimming unit 34 decides whether or not thefirst data data1 is supplied to the first pixel of the first line(S204).

If it is decided in step 204 that the first data data1 is supplied tothe first pixel, the dimming unit 34 decides whether the pattern of thedata is the second or fourth pattern (S206). Here, the pattern of thedata has been decided as the second pattern in step S202, the dimmingunit 34 generates the second data data2 by performing a dimming processon the first data data1 when the first data data1 is supplied to thered, blue and green sub-pixels R, B and G2 included in the first pixel(S208) (dimming process of R, B and G positioned at upper edge/left edgeof FIG. 3B).

In a case where the first data data1 does not correspond to the firstpixel in step S204, the dimming unit 34 decides whether or not the firstdata data1 is input to the last pixel (S210). In a case where it isdecided in step S210 that the first data data1 is supplied to the lastpixel, the dimming unit 34 decides whether the pattern of the data isthe first or third pattern (S212). Here, the pattern of the data hasbeen decided as the second pattern in step 202, and hence the dimmingunit 34 performs a dimming process on the first data data1 correspondingto the red and blue sub-pixels R and B (S214) (dimming process of R andB positioned at upper edge/right edge of FIG. 3B). Meanwhile, in a casewhere it is not decided in step S210 that the first data data1 is inputto the last pixel, i.e., in a case where the first data data1 is inputto one of the pixels positioned between the first and last pixels, thedimming unit 34 performs a dimming process on the first data data1corresponding to the red and blue sub-pixels R and B (S214). Asdescribed above, in a case where the data of the second pattern isinput, the dimming unit 34 generates the second data data2 by performinga dimming process on the first data data1 corresponding to sub-pixelspositioned at the upper edge while passing through steps S202 to S214.

In a case where it is decided in step S202 that the pattern of the datais the third pattern, the dimming unit 34 decides whether or not thefirst data data1 is supplied to the first pixel (S304).

If it is decided in step S304 that the first data data1 is supplied tothe first pixel, the dimming unit 34 decides whether the pattern of thedata is the first or third pattern (S306). Here, the pattern of the datahas been decided as the third pattern in step S202, and hence thedimming unit 34 generates the second data data2 by performing a dimmingprocess on the first data data1 to be supplied to the green sub-pixelsG1 and G2 and the blue sub-pixel B, which are included in the firstpixel (S308) (dimming process of B, G and G positioned at upperedge/left edge of FIG. 3C).

In a case where the first data data1 does not correspond to the firstpixel in step S304, the dimming unit 34 decides whether or not the firstdata data1 is input to the last pixel of the first line (S310). If it isdecided in step S310 that the first data data1 is supplied to the lastpixel, the dimming unit 34 decides whether the pattern of the data isthe second or fourth pattern (S312). Here, the pattern of the data hasbeen decided as the third pattern in step S202, and hence the dimmingunit 34 performs a dimming process of the first data data1 correspondingto the green sub-pixels G1 and G2 (S314) (dimming process of G and Gpositioned at upper edge/right edge of FIG. 3C). Meanwhile, in a casewhere it is not decided in step S310 that the first data data1 is inputto the last pixel, i.e., in a case where the first data data1 is inputto one of the pixels between the first and last pixels, the dimming unit34 performs a dimming process corresponding the green sub-pixels G1 andG2 (S314). As described above, in a case where the data of the thirdpattern is input, the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 corresponding tothe sub-pixels positioned at the upper edge while passing through stepS202, and S304 to S314.

In a case where it is decided in step S202 that the pattern of the datais the fourth pattern, the dimming unit 34 decides whether or not thefirst data data1 is supplied to the first pixel (S304).

If it is decided in step S304 that the first data data1 is supplied tothe first pixel, the dimming unit 34 decides whether the pattern of thedata is the first or third pattern (S306). Here, the pattern of the datahas been decided as the fourth pattern in step S202, and hence thedimming unit 34 generates the second data data2 by performing a dimmingprocess on the first data data1 to be supplied to the green sub-pixelsG1 and G2 included in the first pixel (S314) (dimming process of G and Gpositioned at upper edge/left edge of FIG. 3D).

In a case where the first data data1 does not correspond to the firstpixel in step S304, the dimming unit 34 decides whether or not the firstdata data1 is input to the last pixel (S310). If it is decided in stepS310 that the first data data1 is supplied to the last pixel, thedimming unit 34 decides whether the pattern of the data is the second orfourth pattern (S312). Here, the pattern of the data has been decided asthe fourth pattern in step S202, and hence the dimming unit 34 generatesthe second data data2 by performing a dimming process on the first datadata1 to be supplied to the green sub-pixels G1 and G2 and the bluesub-pixel B, which are included in the last pixel (S308) (dimmingprocess of G, G and B positioned at upper edge/right edge of FIG. 3D).Meanwhile, in a case where it is not decided in step S310 that the firstdata data1 is input to the last pixel, i.e., in a case where the firstdata data1 is input to one of the pixels between the first and lastpixels, the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 corresponding tothe sub-pixels positioned at the upper edge while passing through stepsS202 and S304 to S314.

Meanwhile, it is not decided in step S200 that the first data data1 isthe data to be supplied to the first line, the dimming unit 34 decideswhether or not the first data data1 is a data to be supplied to the lastline (S300). In a case where it is decided in step S300 that the firstdata data1 is the data to be supplied to the last line, the dimming unit34 checks a pattern of the data (S302).

In a case where it is decided in step S302 that the pattern of the datais the first pattern, the dimming unit 34 decides whether the first datadata1 is supplied to the first or last pixel of the last line (S304 andS310). In a case where it is decided in step S304 that the first datadata1 is supplied to the first pixel, the dimming unit 34 decideswhether the pattern of the data is the first or third pattern (S306).Here, the pattern of the data has been decided as the first pattern instep S302, and hence the dimming unit 34 generates the second data data2by performing a dimming process on the first data data1 to be suppliedto the green pixels G1 and G2 and the blue pixel B, which are includedin the first pixel (S308) (dimming process of B, G and G positioned atlower edge/left edge of FIG. 3A).

In a case where it is decided in step S310 that the first data data1 issupplied to the last pixel, the dimming unit 34 decides whether thepattern of the data is the second or fourth pattern (S312). Here, thepattern of the data has been decided as the first pattern in step S302,the dimming unit 34 generated the second data data2 by performing adimming process on the first data data1 to be supplied to the greensub-pixels G1 and G2 included in the last pixel (S314) (dimming processof G and G positioned at lower edge/right edge of FIG. 3A). Meanwhile,it is not decided in step S310 that the first data data1 is not input tothe last pixel, i.e., in a case where the first data data1 is input toone of the pixels between the first and last pixels, the dimming unit 34performs a dimming process of the first data data1 corresponding to thegreen sub-pixels G1 and G2 (S314). As described above, in a case wherethe data of the first pattern is input, the dimming unit 34 generatesthe second data data2 by performing a dimming process on the first datadata1 corresponding to sub-pixels positioned at a lower edge whilepassing through steps S302 to S314.

In a case where it is decided in step S302 that the pattern of the datais the second pattern, the dimming unit 34 decides whether the firstdata data1 is supplied to the first or last pixel (S304 and S310). In acase where it is decided in step 304 that the first data data1 issupplied to the first pixel, the dimming unit 34 decides whether thepattern of the data is the first or third pattern (S306). Here, thepattern of the data has been decided as the second pattern in step S302,and hence the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 to be supplied tothe green sub-pixels G1 and G2 included in the first pixel (S314)(dimming process of G and G positioned at lower edge/left edge of FIG.3B).

In a case where it is decided in step S310 that the first data data1 issupplied to the last pixel, the dimming unit 34 decides whether thepattern of the data is the second or fourth pattern (S312). Here, thepattern of the data has been decided as the second pattern in step S302,and hence the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 to be supplied tothe green sub-pixels G1 and G2 and the blue sub-pixel B, which areincluded in the last pixel (S308) (dimming process of G, G and Bpositioned at lower edge/right edge of FIG. 3B). Meanwhile, in a casewhere it is not decided in step S310 that the first data data1 is inputto the last pixel, i.e., in a case where the first data data1 is inputto one of the pixels between the first and last pixels, the dimming unit34 performs a dimming process on the first data data1 corresponding tothe green sub-pixels G1 and G2 (S314). As described above, in a casewhere the data of the second pattern is input, the dimming unit 34generates the second data data2 by performing a dimming process on thefirst data data1 corresponding to the sub-pixels positioned at the loweredge while passing through steps S302 to S314.

In a case where it is decided in step S302 that the pattern of the datais the third pattern, the dimming unit 34 decides whether the first datadata1 is supplied to the first or last pixel (S204 and S210). In a casewhere it is decided at step S204 that the first data data1 is suppliedto the first pixel, the dimming unit 34 decides whether the pattern ofthe data is the second or fourth pattern (S206). Here, the pattern ofthe data has been decided as the third pattern in step S302, and hencethe dimming unit 34 generates the second data data2 by performing adimming process on the first data data1 to be supplied to the red andblue sub-pixels R and B included in the first pixel (S214) (dimmingprocess of R and B positioned at lower edge/left edge of FIG. 3C).

In a case where it is decided in step S210 that the first data data1 issupplied to the last pixel, the dimming unit 34 decides whether thepattern of the data is the first or third pattern (S212). Here, thepattern of the data has been decided as the third pattern in step S302,and hence the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 to be supplied tothe red, blue and green sub-pixels R, B and G included in the last pixel(S208) (dimming process of R, B and G positioned at lower edge/rightedge of FIG. 3C). Meanwhile, in a case where it is not decided in stepS210 that the first data data1 is input to the last pixel, i.e., in acase where the first data data1 is input to one of the pixels betweenthe first and last pixels, the dimming unit 34 performs a dimmingprocess on the first data data1 corresponding to the red and bluesub-pixels R and B (S214). As described above, in a case where the dataof the third pattern is input, the dimming unit 34 generates the seconddata data2 by performing a dimming process on the first data data1corresponding to the sub-pixels positioned at the lower edge whilepassing through steps S302 and S204 to S214.

In a case where it is decided in step S302 that the pattern of the datais the fourth pattern, the dimming unit 34 decides whether the firstdata data1 is supplied to the first or last pixel (S204 and S210). In acase where it is decided in step S204 that the first data data1 issupplied to the first pixel, the dimming unit 34 decides whether thepattern of the data is the second or fourth pattern (S206). Here, thepattern of the data has been decided as the fourth pattern in step S302,and hence the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 to be supplied tothe red, blue and green sub-pixels R, B and G2 included in the firstpixel (S208) (dimming process of G, B and R positioned at loweredge/left edge of FIG. 3D).

In a case where it is decided in step S210 that the first data data1 issupplied to the last pixel, the dimming unit 34 decides whether thepattern of the data is the first or third pattern (S212). Here, thepattern of the data has been decided as the fourth pattern in step S302,and hence the dimming unit 34 generates the second data data2 byperforming a dimming process on the first data data1 to be supplied tothe red and blue sub-pixels R and B included in the last pixel (S214)(dimming process of R and B positioned at lower edge/right edge) of FIG.3D). Meanwhile, in a case where it is not decided in step S210 that thefirst data data1 is input to the last pixel, i.e., in a case where thefirst data data1 is input to one of the pixels between the first andlast pixels, the dimming unit 34 performs a dimming process on the firstdata data1 corresponding to the red and blue sub-pixels R and B (S214).As described above, in a case where the data of the fourth pattern isinput, the dimming unit 34 generates the second data data2 by performinga dimming process on the first data data1 corresponding to thesub-pixels positioned at the lower edge while passing through steps S302and S204 to S214.

Meanwhile, in a case where it is not decided in step S300 that the firstdata data1 is the data to be supplied to the last line, i.e., in a casewhere the first data data1 is a data to be supplied to one of the linesbetween the first and last lines, the dimming unit 34 checks a patternof the data (S400).

In a case where it is decided in step S400 that the pattern of the datais the first or second pattern, the dimming unit 34 decides whether ornot the first data data1 is supplied to the first or last sub-pixel(S402 and S411).

In a case where it is decided in step S402 that the first data data1 isa data corresponding to the first sub-pixel, the dimming unit 34 decideswhether or not the pattern of the data is the first pattern (S404). In acase where it is decided in step S404 that the pattern of the data isthe first pattern, the dimming unit 34 decides whether or not the firstdata data1 is supplied to an odd-numbered line (S406). In a case whereit is decided in step S406 that the first data data1 is supplied to theodd-numbered line, the dimming unit 34 performing a dimming process onthe first data data1 by deciding that the first data data1 is a data tobe supplied to the red sub-pixel R (S408). In a case where it is decidein step S406 that the first data data1 is not supplied to theodd-numbered line, the dimming unit 34 performs a dimming process on thefirst data data1 by deciding that the first data data1 is a data to besupplied to the blue sub-pixel B (S410).

In a case where it is not decided in step S404 that the pattern of thedata is the first pattern, the dimming unit 34 decides whether or notthe first data data1 is supplied to the odd-numbered line (S414). In acase where it is decided in step S414 that the first data data1 issupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is a data to be supplied to the green sub-pixel G2 (S416). In acase where it is decided in step S414 that the first data data1 is notsupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is the data to be supplied to the green sub-pixel G1 (S418).

In a case where it is decided in step S411 that the first data data1 isa data corresponding to the last sub-pixel, the dimming unit 34 whetheror not the pattern of the data is the first pattern (S412). In a casewhere it is decided in step S412 that the pattern of the data is thefirst pattern, the dimming unit 34 decides whether or not the first datadata1 is supplied to the odd-numbered line (S414). In a case where it isdecided in step S414 that the first data data1 is supplied to theodd-numbered line, the dimming unit 34 performs a dimming process on thefirst data data1 by deciding that the first data data1 is the data to besupplied to the green sub-pixel G2 (S416). In a case where it is decidedin step S414 that the first data data1 is not supplied to theodd-numbered line, the dimming unit 34 performs a dimming process on thefirst data data1 by deciding that the first data data1 is the data to besupplied to the green sub-pixel G1 (S418).

In a case where it is not decided in step S412 that the pattern of thedata is the first pattern, the dimming unit 34 decides whether or notthe first data data1 is supplied to the odd-numbered line (S406). In acase where it is decided in step S406 that the first data data1 issupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is a data to be supplied to the red sub-pixel R (S408). In a casewhere it is decided in step S406 that the first data data1 is notsupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is a data to be supplied to the blue sub-pixel B (S410).

Practically, in a case where the data of the first or second pattern isinput, the dimming unit 34 performs a dimming process on the first datadata1 to be supplied to the sub-pixels positioned at edges of the otherlines except the first and last lines, i.e., the first and lastsub-pixels, using steps S400 to S418.

In a case where it is decided in step S400 that the pattern of the datais the third or fourth pattern, the dimming unit 34 decides whether thefirst data data1 is supplied to the first or last sub-pixel (S421 andS425).

In a case where it is decided in step S421 that the first data data1 isa data corresponding to the first sub-pixel, the dimming unit 34 decideswhether or not the pattern of the data is the third pattern (S420). In acase where it is decided in step S420 that the pattern of the data isthe third pattern, the dimming unit 34 decides whether or not the firstdata data1 is supplied to the odd-numbered line (S422). In a case whereit is decided in step S422 that the first data data1 is supplied to theodd-numbered line, the dimming unit 34 performs a dimming process of thefirst data data1 by deciding that the first data data1 is a data to besupplied to the blue sub-pixel B (S410). In a case where it is decidedin step S422 that the first data data1 is not supplied to theodd-numbered line, the dimming unit 34 performs a dimming process on thefirst data data1 by deciding that the first data data1 is a data to besupplied to the red sub-pixel R (S408).

In a case where it is not decided in step S420 that the pattern of thedata is the third pattern, the dimming unit 34 decides whether or notthe first data data1 is supplied to the odd-numbered line (S424). In acase where it is decided in step S424 that the first data data1 issupplied to the odd-numbered line, the dimming unit 34 performs adimming process of the first data data1 by deciding that the first datadata1 is a data to be supplied to the green sub-pixel G1 (S418). In acase where it is decided in step S424 that the first data data1 is notsupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is a data to be supplied to the green sub-pixel G2 (S416).

In a case where it is decided in step S425 that the first data data1 isa data corresponding to the last sub-pixel, the dimming unit 34 decideswhether or not the pattern of the data is the third pattern (S426). In acase where it is decided in step S426 that the pattern of the data isthe third pattern, the dimming unit 34 decides whether or not the firstdata data1 is supplied to the odd-numbered line (S424). In a case whereit is decided in step S424 that the first data data1 is supplied to theodd-numbered line, the dimming unit 34 performs a dimming process of thefirst data data1 by deciding that the first data data1 is the data to besupplied to the green sub-pixel G1 (S418). In a case where it is decidedin step S424 that the first data data1 is not supplied to theodd-numbered line, the dimming unit 34 performs a dimming process on thefirst data data1 by deciding that the first data data1 is the data to besupplied to the green sub-pixel G2 (S416).

In a case where it is not decided in step S426 that the pattern of thedata is the third pattern, the dimming unit 34 decides whether or notthe first data data1 is supplied to the odd-numbered line (S422). In acase where it is decided in step S422 that the first data data1 issupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is a data to be supplied to the blue sub-pixel B (S410). In a casewhere it is decided in step S422 that the first data data1 is notsupplied to the odd-numbered line, the dimming unit 34 performs adimming process on the first data data1 by deciding that the first datadata1 is a data to be supplied to the red sub-pixel R (S408).

Practically, in a case where the data of the third or fourth pattern isinput, the dimming unit 34 performs a dimming process while repetitivelyperforming the aforementioned procedure on the sub-pixels positioned atthe edges of the other lines except the first and last lines, i.e., thefirst and last sub-pixels.

As described above, the dimming unit 34 performs a dimming process ondata to be supplied to the sub-pixels positioned at the edges of thepanel corresponding to the first, second, third and fourth patterns ofthe data while being driven as shown in FIG. 6. Here, a dimming valuecorresponding to each of the sub-pixels R, B, G1 and G2 isexperimentally determined in consideration of the resolution, inch andlight emitting efficiency of the panel. For example, the dimming unit 34may generate the second data data2 by performing a dimming process onthe first data data1 so that the luminance of the sub-pixels is loweredby a factor of ½, corresponding to the red and blue sub-pixels R and B.The dimming unit 34 may generate the second data data2 by performing adimming process on the first data data1 so that the luminance of thegreen sub-pixel G1 is lowered by a factor of ⅗ and the luminance of thegreen sub-pixel G2 is lowered to 4/7.

That is, the dimming unit 34 can detect the red sub-pixel R, the bluesub-pixel B and the green sub-pixels G1 and G2, which are positioned atthe edges of the panel, while being driven as shown in FIG. 5.Accordingly, various dimming processes are possible.

While the various features and aspects have been described in connectionwith certain exemplary embodiments, it is to be understood that theinvention is not limited to the disclosed embodiments, but, on thecontrary, is intended to cover various modifications and equivalentarrangements.

What is claimed is:
 1. An organic light-emitting display panel,comprising: a first group of pixel rows and columns comprisingodd-numbered pixel rows and odd-numbered pixel columns; a second groupof pixel rows and columns comprising even-numbered pixel rows andeven-numbered pixel columns; first color sub-pixels and second colorsub-pixels arranged only in the pixel rows and columns of one of thefirst and second groups, wherein the first color sub-pixels and thesecond color sub-pixels are alternately arranged in each of the pixelrows and columns of the one of the first and second groups; and thirdcolor sub-pixels arranged in the pixel rows and columns of another oneof the first and second groups, wherein a size of one of the third colorsub-pixels is smaller than a size of one of the first or second colorsub-pixels.
 2. The organic light-emitting display panel of claim 1,wherein the first color sub-pixels are configured to emit red light, thesecond color sub-pixels are configured to emit blue light, and the thirdcolor sub-pixels are configured to emit green light.
 3. The organiclight-emitting display panel of claim 1, wherein each of the third colorsub-pixels is at a diagonal direction with respect to one of the firstor second color sub-pixels.
 4. The organic light-emitting display panelof claim 1, wherein the third color sub-pixels are arranged only in thepixel rows and columns of the another one of the first and secondgroups.
 5. An organic light-emitting display panel, comprising: a firstgroup of pixel rows and columns comprising odd-numbered pixel rows andodd-numbered pixel columns; a second group of pixel rows and columnscomprising even-numbered pixel rows and even-numbered pixel columns;first color sub-pixels and second color sub-pixels arranged in the pixelrows and columns of one of the first and second groups, wherein thefirst color sub-pixels and the second color sub-pixels are alternatelyarranged in each of the pixel rows and columns of the one of the firstand second groups; and third color sub-pixels arranged only in the pixelrows and columns of another one of the first and second groups, whereina size of one of the third color sub-pixels is smaller than a size ofone of the first or second color sub-pixels.
 6. A display device,comprising: a display panel comprising: a first group of pixel rows andcolumns comprising odd-numbered pixel rows and odd-numbered pixelcolumns; a second group of pixel rows and columns comprisingeven-numbered pixel rows and even-numbered pixel columns; first colorsub-pixels and second color sub-pixels alternately arranged in each ofthe pixel rows and columns of one of the first and second groups; andthird color sub-pixels arranged only in the pixel rows and columns ofanother one of the first and second groups; a scan driver configured todrive scan lines coupled to the first, second and third colorsub-pixels; a data processor configured to receive first data and togenerate second data based on the first data, wherein the data processoris configured to generate the second data by changing grayscale valuesof the first data for the first, second, or third color sub-pixelspositioned in first and last pixel rows from among the pixel rows andfirst and last pixel columns from among the pixel columns of the displaypanel; and a data driver configured to drive data lines connected to thefirst, second, and third color sub-pixels in response to the first orsecond data.
 7. The display device according to claim 6, wherein: thedata processor comprises a dimming unit configured to generate thesecond data; and the dimming unit is configured to decide whether thefirst data is data for the first pixel row, the last pixel row or otherpixel rows of the display panel.
 8. The display device according toclaim 7, wherein the dimming unit is configured to generate the seconddata by reducing the grayscale values of the first data.
 9. The displaydevice according to claim 8, wherein the dimming unit is configured togenerate the second data by reducing the grayscale values of the firstdata corresponding to sub-pixels on the first and last pixel rows andfirst and last sub-pixels on the other pixel rows.
 10. The displaydevice according to claim 7, wherein the dimming unit is configured togenerate the second data by changing the grayscale values of the firstdata corresponding to selected sub-pixels positioned in each pixelcolumn of the display panel based on a decision of the dimming unit. 11.The display device of claim 6, wherein a size of one of the third colorsub-pixels is smaller than a size of one of the first or second colorsub-pixels.
 12. The display device of claim 11, wherein the first colorsub-pixels are configured to emit red light, the second color sub-pixelsare configured to emit blue light, and the third color sub-pixels areconfigured to emit green light.
 13. The display device of claim 6,wherein the display panel is configured to operate in a plurality ofpositions, each of the positions having a sub-pixel color pattern basedon an arrangement of the first, second and third color sub-pixels. 14.The display device of claim 13, wherein the first data is to be suppliedaccording to the sub-pixel color pattern corresponding to each position.15. The display device of claim 14, wherein the data processor isconfigured to detect a pattern of the first data and to perform adimming process on the first data based on a detected pattern of thefirst data.
 16. The display device of claim 6, wherein each of the thirdcolor sub-pixels is at a diagonal direction with respect to one of thefirst or second color sub-pixels.